Since the last 23th march 2018 update, we had a lot of colission issue. After a search between all mods we have, this is only due to auto-torches mod, that got a HUGE radius of collision.
Here is the setting of our server : https://ark.sheepy.fr/index.php/reglages-du-serveur/
(in french but hte list of mods in on the bottom).

Please let us know if there is a solution or a planned update.